Process of burning lime.



J. G. JONES.

PROCESS OF BURNING LIME.

APPLICATION FILED JAN. 27, 1911.

Patented De 12, 1911.

JOHN G. JONES, 0F CARTHAGE, NEW YOItK.

PROCESS OF BURNING LIME.

Specification of Letters Patent.

Application filed January 27, 1911.

Patented Dec. 12, 1911.

Serial No. 605,102.

To all whom it may concern:

Be it known that I, JOHN G. JoNEs, a

citizen of the United States, residing at Carthage, in the county ofJefierson and State of New York, have invented certain new and usefulImprovements in Processes of Burning Lime; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake'and use the same, reference being had to the accompanying drawings,and to the letters of reference marked thereon, which form a part ofthis specification.

This invention relates to new and useful processes of burning lime bythe combined use of a vertically disposed stationary and a rotatablekiln in connection with a gas producer, the object of the inventionbeing to utilize the waste heat from the rotary kiln to partiallydisassociate the CO gas from the limestone before entering the rotarykiln, thereby converting the entire length of the rotary kiln into aburning zone for removing the balance of the CO gas, and reducing thelime to an oxid state.

The invention consists further in the process of burning lime by theemployment of combination stationary and rotary kilns,'in connectionwitha gas producer, and by the admixture of a quantity of limestone with thefuel of the gas producer, whereby a long and slow burning flame may beproduced, the limestone thus admitted, being reduced by heat from itscarbonate to an oxid state,

and giving off carbonic acid gas which mixes with the producer gas, theoxid of lime within the gas" producer, becoming slaked as it reaches thewater with which the producer is sealed, and thus having a tendency tokeep the cinder from slagging, and cansing the producer to work moreeasily and better in every way than without presence of the limestonemixed with the fuel.

Another and an important object of the invention, consists in the methodofforming lime by the use of combination kilns and gas producer, orother heat producing material, wherein the dust formed by the limepassing through the rotary kiln, may be gathered up a vertical kiln andretained by the particles of limestone therein, thus avoiding the use ofthe large and expensive dust chambers.

Still another and important feature of the present invention resides inthe provision of partitions, formed longitudinally through the kiln, anddesigned to divide u the material as it passes through the iln, andofiering a greater radiating surface against which the lime contacts as1t passes through the kiln.

A combined apparatus which may be employed in carrying vout the steps.of my process, I have illustrated in the accompany ing drawings in whichFigure 1 is a vertical sectional view through a combination verticallyand horizontally disposed kiln. Fig. 2 is a sectional view on line 22,of Fig. 1 and Fig. 3 is i a sectional view on line 3, 3, of Fi 1. v

Reference now being had to t edetails of the drawings by letter Adesignates a vertically disposed stationary kiln mounted upon a suitablefoundation B, said kiln having preferably a steel shell with a firebrick lining G and provided, at intervals with openings D forming meanswhereby instruments may be inserted for the purpose of breaking down anyarches which may form within the kiln, and D is a pyrometer employed forthe purpose of indicating the temperature of ,theheat ofthe kiln.. The

upper end of the stationary kiln has a hopper E of special design, and.so arranged that the draft upon the kiln will not be affected by thedischarge of the limestone therein. \Vithin said hopper are the twobalanced partitions, designated respectively by letters -E and E thelimestone being adapted to be fed to the hopper in any suitable mannernot shown.

The lower portion of the vertical kiln, adjacent to its exit end, iscontracted and disposed at an inclination, and I communicates with alaterally extending shell G about which one end of the kiln K rotates,

a suitable ring K fixed to the shell G, serves to close the spaceintervening between the shell and rotary kiln. The rotary kiln ismounted upon antifriction rollers, and may be driven in any suitablemanner, and at such a speed as may be found necessary to produce thebest results. 7

In the present instance I have shown a gas producer H ing heat. to thekiln, although of course any heat producing means may be employed ifdesired, and leading from the gas producer is a pipe H whichcommunicates with the vertical stack H, which serves as as a suitablemeans for produca connection for thepurpose of conducting gas from theproducer to the kiln, while the bottom of said stack serves as a chamberfor the collectioh of soot from the gas and 5 which stack communicates,through the passageway H with. the chamber H in an opening in which, oneend of the rotary kiln is disposed. By this arrangement it will be notedthat a free passageway will be afforded from the gas producer throughthe two kilns.

Opening into the lower contracted portion of the upright stationarykiln,.is casing I in which a reciprocable feed plunger I is mounted, thelatter being pivotally connected with a pitman J, which in turn ispivotally connected to a pin J mounted eccentrically upon the disk Jfixed to the shaft J and which may be driven in any suitable manner, andat such a speed as may be desired to cause the limestone to be deliveredto the rotary kilnin proper quantit-ies.

Leading tionary kiln is a pipe L communicating with the fan casingL andfrom which latter a pipe L leads through which the gases drawn from thekilns, may escape. By the provision of the fan, it will be observed thatthe draft upon the kilns may be regulated to a nicety, and the heatacting upon the lime being burned easily regulated.

By reference to the cross-sectional view through the rotary kiln, itwill be noted i that the latter is provided with interior partitions,which intersect each other, and divide the kiln into a series ofcompartments, the partitions being designated by letter M. Thesepartitions are provided, so that the material as it is fed by a wormfeed M into the various compartments will be subjected to a much greaterheating surface than would be the case were it not for the partitions.As the limestone enters the rotary kiln it will be partiallydisassociated from its CO gas, and by the rotary movement of the kiln atan inclination, the lime will be fed forward gradually, being subjectedto the actionof the flame and enabling same 59 to be thoroughly anduniformly reduced to an oxid state;

Positioned about the lower portion of the vertical kiln are the pipes Qwhich lead through the wall of the kiln and are provided for the purposeof admitting steam, into the vertical kiln to commingle with theparticles of limestone, and which will serve to prevent the particlesfrom sticking together or to the wall of the kiln, and which 60 steamwill also assist in the process of disassociating the CO gas from thelimestone before it enters the rotary kiln.

In operation, the rotary kiln being pitched at a proper angle and theparts adjusted as shown with the vertical kiln filled with limefrom thesealed top of the sta stone, which may be in pieces of any size, eitherfine or coarse, the producer gas or other heat producing material, isignited and, by means of a natural or mechanical draft, the flametherefrom will be drawn therefrom through the horizontal kiln and up andamong the particles of limestone within the vertical kiln. By theadmixture of a certain percentage of limestone with the fuel in the gasproducer, carbon dioxid gas is formed, and a slow burning long flamewill be produced, and as the limestone, which is mixed with the fuel isconverted by the heat from its carbonate, to an oxid state, the CO gaswill be given off and the oxid of lime within the fuel, as it reachesthe water, will slake and' have'a tendency to keep the cinder fromslagging, thus cans.- ing the gas producer to work more satisfactorilythan would be the case without the addition of the limestone to the'fuel. The effect of the CO gas given off from the limestone, willmingle with the producer gas and produce a long and slow burning flamewithin the rotary kiln. When the temperature within the vertical kilnhas registered sufficiently high, which may be determined with the useof a pyrometer at any proper location therein, the rotary kiln isput inmotion, and a certain quantity of limestone will be fed therein from thevertical kiln and be moved forward into the burning zone of the rotarykiln. The limestone in the vertical kiln will follow down to replace theamount, which will be fed by a. variable movement of the plunger. By theuse of the horizontal kiln of a considerable diameter divided intocompartments, the length of the kiln may be appreciably shortened, andby so doing the flame from the gas producer may be carried immediatelythrough the rotary kiln, imparting its heat to the lime in the severalcompartments, and up into the vertical kiln, bringing the limestonewithin the latter practically to a point of disassociation of its CO gasbefore the limestone enters the rotary kiln. By this method it will benoted that the entire length of the kiln will constitue a burning zonewherein the lime will be converted during its passage therethrough intoan oxid state.

It will be noted that the dust formed within the rotary kiln will passthrough into the vertical kiln and be retained therein among theparticles of limestone and thus avoiding the use of speciallyconstructed and expensive dust-chambers. The waste gases as they passthrough and out the upper end of the vertical kiln, will have given uptheir heat to the incoming limestone so that, as they make exit to theatmosphere, they will be practically cold, thus doing away withexpensive waste heat steam boilers.

In burning lime by my improved method, as herein described, I have foundthat the particles of limestone of large and smallsizes may be burnedwith equally good results, and not only is the process economical offuel, but in cost of installation, and effecting a considerable savingof labor.

What I claim to be new is,

1. A process of burning lime consisting of first passing the limestonethrough a vertical lc'ln, and subjecting the same in its carbonate stateto the action of heat to substantially the point of disassociation fromthe limestone of its CO gas, thence caus-,

ing the limestone to pass through a rotary kiln, wherein it is reducedby heat to an oxid state.

2. A process of burning lime consisting of first passing the limestonethrough a vertical kiln and subjecting same, in its carbonate state, tothe action of heat to substantially the point of disassociation from thelimestone of its CO gas, the introduction of steam within the verticalln'ln 0 commingle with the limestone therein, and afterward causing thelimestone to pass through a rotary kiln where it is reduced by heat, toan oxid state.

3. A process of burning lime consisting in the subjecting of theparticles of limestone substantially disassociated from its CO gas, toheat within a rotary kiln,- and thus converting the limestone into anoxid state, of conducting the heat and dust generated within the rotarykiln into a vertical kiln containing particles of limestone in which thedust is gathered and retained by the limestone.

In testimony whereof I hereunto afiixed my signature in the presence oftwo witnesses.

JOHN G. JONES.

Witnesses:

H. L. JONES, M. L. JONES.

